Questions & Answears Q：If i found these haevy duty stianless steel rings have defective ones, while do not bother returning them back, what can you do for me ? A: Our round metal heavy duty stainless steel key rings are made of premium sturty alloy, if you found any defective stainless steel key rings, just contact us, we will refund all of your payment without returning these staibless steel key rings back. Q：These round metal key heavy duty stianless steel rings are easy to use, and can stay closed tightly ? I am really worried about the keys may fall apart ! A: Our metal heavy duty stainless steel key rings has a great spring reatention, it is convenient to open, and spring back to close tightly. No need to worry the keys may fall appart. :-) Q：I want to use these heavy duty stainless steel key rings as the attachment rings for my dog collar tags, which size should i use ? A: To this matter, we have tested specially, and find 1/2 inch (15mm) stainless steel heavy duty key ring is most suitable, of course, if you have special needs, you can try other sizes The pacakge includes: 4pcs * Stainless Steel Heavy Duty Key Rings 1/2 inch (15mm) 4pcs * Stainless Steel Heavy Duty Key Rings 3/4 inch (20mm) 4pcs * Stainless Steel Heavy Duty Key Rings 1 inch (25mm) 4pcs * Stainless Steel Heavy Duty Key Rings 1.2 inch (30mm) 4pcs * Stainless Steel Heavy Duty Key Rings 1.2 inch (35mm)